// date.js
export function formatDate(date, fmt) {
	if (/(y+)/.test(fmt)) {
		fmt = fmt.replace(RegExp.$1, (date.getFullYear() + '').substr(4 - RegExp.$1.length));
	}
	let o = {
		'M+': date.getMonth() + 1,
		'd+': date.getDate(),
		'h+': date.getHours(),
		'm+': date.getMinutes(),
		's+': date.getSeconds()
	};
	for (let k in o) {
		if (new RegExp(`(${k})`).test(fmt)) {
			let str = o[k] + '';
			fmt = fmt.replace(RegExp.$1, (RegExp.$1.length === 1) ? str : padLeftZero(str));
		}
	}
	return fmt;
}

function padLeftZero(str) {
	return ('00' + str).substr(str.length);
}

export function str2Date(dateStr, separator) {
	if (!separator) {
		separator = "-";
	}
	let dateArr = dateStr.split(separator);
	let year = parseInt(dateArr[0]);
	let month;
	//处理月份为04这样的情况
	if (dateArr[1].indexOf("0") == 0) {
		month = parseInt(dateArr[1].substring(1));
	} else {
		month = parseInt(dateArr[1]);
	}
	let day = parseInt(dateArr[2]);
	let date = new Date(year, month - 1, day);
	return date;
}

export function dateAddDays(dateStr, dayCount) {
	var tempDate = new Date(dateStr.replace(/-/g, "/")); //把日期字符串转换成日期格式
	var resultDate = new Date((tempDate / 1000 + (86400 * dayCount)) * 1000); //增加n天后的日期
	var resultDateStr = resultDate.getFullYear() + "-" + (resultDate.getMonth() + 1) + "-" + (resultDate.getDate()); //将日期转化为字符串格式
	return resultDateStr;
}
